Hot-air furnace



J. B. KOEHLER.

HOT AIR FURNACE. APPLICCATION FILED NOV. 15.1921.

1,41 1,037, Patented Mar. 28, 1922.

3 SHEETSSHEET I.

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I 4 v /L f M & l? i Q J. B. KOEHLER.

HOT MB FURNACE.

APPLICATION FILED Nov.15. 1921.

1,411,037, Patented Mar.28,1922

a SHEETS-SHEET 2.

rArEN OFFlC E,

nouns n. KOEELER, oFCINCINNA'rI, onro, assreNon 'ro rrrn MONITOR s'rovnf COMPANY, or CINCINNATI, onro, A conronA'rro or ,onro.

drical casings are relatively spaced and disposed about a heater to form an inner main hot-ai r chamber and Lip-passage, and a coldair duct or down passage, thetwo inner casings spaced to form the mitercoldair and the inner warm-air passages, by an upwardly circulating air passage'as an insulator partition between said warm and coldair passages, to prevent reciprocal radiation between said main hot-air chamber and passage, and c0ld-air passage or duct.

This invention, as an improvement in furnaces, is generally relatedto Patent No. 1,846,801, granted to WVilliam J. Doyle and Justus J. Wollenhaupt, July 13, 1920. As shown in this patent, and as illustrated in Fig. 1, the hot-air chamber and passage is connected at its top centrally of a floor register, and the cold-air passage or duct is connected to the same register marginally thereof. The hot-air chamber and passage and the cold-air duct or passage communicate at a point below the heating Zone, and the inner casing or drum of the double walled insulating partition, stops short of the register, allowing communication at that point between the restricted partition passage and the hotair chamber or passage. The double-walled insulating partition is intercepted circumferentially at the frontof the furnace by the ash-pit and combustion chamber hoppers or shouts, the respective ends of the spaced casings, forming the in sulating partition, being outwardly turned and fastened to the outer casing, thus forming a forward extension of the hot-air chamber and passage aboutsaid hoppers, and also forming extensions of the insulating partition thereabout, and a horizontal division wall between the cold-air passage andwarm-air chamber. In order to close the segmental opening above the hot-air chamher over the hoppers and between the insulating partition and the outer casing, to

HOT-AIR rUnNAcn.

, Specification of Letters Patent. Patented Mar,

Application filed November 15, 1921. Serial No. 515,412.

prevent passage of hot-air into the cold air duct, a segmental iron division platehas heretofore been used,for bridging and sealing the opening, as shown in the above-mentioned patent; i

In practice it has been-found that radiation takes place from the'hot-air chamber and passage, through the plate, upwardly to the cold-air duct, whereby thecirculation oi? the cold air "at this point is'impaired, which condition materially interferes with the generalheater circulation, asitis essential that the cold-air passage always be maintained as such, and notconnected into a hot-airpassage by heat radiating through the dividing walls. v y i The main object of this invention isthere fore to improve thegeneral heating efii ciency of the type 0]": furnace called pipeless, anddescribed in the aforementioned patent, by preventing theprocluction' of counter currents, within thecold-air duct, caused by radiation through the division plate, the object being accomplished by providing a hollowboxdike thin walled division plate permitting communication be tween the cold-air duct orpassage and the interior of the' 'double-walled insulating partition, in such a manner thatany radiant heat deliveredthrough the b'ottomof the division plate and 'at the interior of the same, will be mixed with downwardly traveling coldair, and syphoned upwardly through the double-walled partition, by the heated air therewithin and delivered to the register.

.Other objects and certain advantages will be disclosed in the description of the" draw ings, forming a part of this specification, and special reference isma'de to said draw ings,in which: Fig. 1 is acentral vertical perspective section illustrating the application. of my ina vention inn pipelessifurnace'.

Fig. 21's a fragmentary plan sectionshowing the disposition of my improved division plate above the clean-out snout. 1 Fig. 3 isa vertical section on line 3,- 3', Fig. 2, looking in the direction of the, arrows. Fig. t is a view. similar to'Fig. 3, on line 4, l, Fig. 2, parts thereof being broken away to better illustrate. the construction;

Fig. 5 is an enlarged 'detail section vertically through the clean-out spout, showing mydivision plate placed there'abo've'.

Fig. 6 is a section on line 6, 6, Fig.5, broken away to show one manner of connecting the heaterdrums or casings to theends of the division plate. Fig. 7 is a bottom plan of the detached plate.

plate.

Referring particularly to Fig. 1 of the drawings, '1" designates the ash-pit of the heater structure accessible through a. hopper or snout closed by a door at the front of the furnace. 2.2 isthe fire-box,'3 the fire-box dome orcombustion chamber connected by ahopper or snout and closed by a door at thefrontzof the 'furnace,,and 4 is the hotair radiator connected at its rear with the smoke pipe, and having a clean-out snout at, its forward side closed by a suitable door. The snouts of the various elements of the heater connect, with a face plate which may l e-regarded as a part of the outer furnace casing; A hot-air'chamber is formed about the above-mentioned parts or heater by a doublewalled insulating partition comprisingan inner'drum or casing 11 and a second drumor casing 12 relatively slightly spaced from the drum 11 to form a hot-air circulating;- space or channel 13, a between the drums orcasings, "for the; purpose of preventing reciprocal "radiation between the hot-air chamber; and the cold-air duct 14:, formed betweentheinsulating partition and the outer furnace casing 15'. The cold-air duct and hot-airchamber communicate belowthe heating zone, and the bottom of the partition is spaced and supported above the floor bysuitable stanchions. The upperpart of the partition is. constricted directly above 7 hollow division plate is provided with two the radiator 4-, by detachable conical and spaeedadrumv sections 16, 16', forming an expansion; chamber 10, the upper truncated ends of which 'are in turn detachably connected to. pipe sections 17 17 the section 17 being connected to a floorregister 20, while the inner section 17' stops short of the regiSter to allow communicatlon betweenthe passage 13 and the hot-air chamber and passage 10; The outer furnace casing-15 is connected with an upper drum section 21, circular "at its. bottom periphery and rectangular at its top, forming between itself and the section 16 an enlarged-substantially concentric passage 22. The drum section 21- is connected marginally of the register 20,

' through a rectangularpipe section 23,. A

cold-air ductor passage and aghotrair chamber and passage are thus formedand insulated fromone'another bya double-walled partition, providing a narrow heat circulating space and acting as a screen to prevent mutual radiationbetween said duct and said chamber and passage.

The casings 11 and 12 at: a point each side ofthe, hoppers and clean-out snout are respectively bent and forwardly directed as at 29, 30., and attached to the casing15 or to the front face plate 15, forming parallel terminal continuationsof the channel 13 at each side of the hoppers and clean-out snout and forming also a continuation of the hot-air chamber forwardly to the door As herebefore stated, a segmental opening is formed above the forward extension of the hot-air chamber on both sides of the hoppers and clean-out snout and between the insulating partitions and the outer casing 15,- which it is the object of the invention to bridge and close in such a manner as to prevent radiation or circulation between the hot-air chamber and passage and cold-air conductor passage at this point. To this end, a perforated hollow segmental box-like horizontal division plate or wall is provided, the bottom of which may rest upon the clean-out snout. The division plate, or spaceddouble-walled cross-partition is interiorly connected at its ends with the passage 13 of the double-walled vertical partition (see Figs. 3 and 4), to provide for hot-air. circulation between the passage and the interior of the division plate or wall. upwardly and into the constricted or conical section of said partition, and thence to the register. The division plate further functions, to syphon the down-coming cold air which enters the interior of the plate and to .mix the same with any radiated heat dethe division plate, to the impairment of gen eral' heaterefiiciency. The top 31 of the rows of 'perforations,.an inner row 32 and an outer row 33 respect vely in connection above the dlvlsion plate withthe passages or chambers 13 22 the )assa e 22 bein a continuation of the passage 14.

Figs. 2, and o best show'the relations of the division wall to the cold and" hot-air ducts orpassages. he bottom 34- extends short of the ends of the wall to form rectangular openings in direct communication with the forward extensionsof the passage 13beneatlr thedivision wall. Theends of this bottom plateQ, marginally .of these openings, a re extended downwardly and are suitably fastenedas at 35 to the upper edges of the for-wardlydisposed extensions 29 of the drum-11, while the upper ends 30 of the drum12 abutand are fastened to the ends of the plateyas at. 36....As constructed, air

passing. upwardly in the; laterally extending portions of the circulatingspace 13 will enter the horizontal air space at each end of the plate and: will pass upwardly through the openings 32:.and continue upwardly to the channel 13 above the plate orboX, and thenceto the register and into-the room.

The detailed connction of the drums with llO , ing

my improved division plate or hollow cross wall may vary, but essentially the channel or passage of the insulating partition and of the cold-air duct or passage above the plate, will inter-communicate interiorly thereofto prevent radiation of the hot-air to the said cold-air duct.

Descending air entering the interior of the horizontal hollow division wall will absorb the heat radiating from the lower plate 34 and then pass upwardly through the open- 32 into the intermediate or insulating space 13.

Having described my invention, I claim:

1. In a hot-air single register furnace, the combination with a heater having forwardly extending feed and cleanout snouts, an outer casing around said heater connecting with said snouts, a double-walled inner casing between said heater and said outer casing, spaced therefrom to provide an outer down cold-air passage between said outercaslng and inner double-walled casing, an up hot-air passage between the heater and the double-walled inner casing, said passages communicating near the base of said furnace and said double-walled inner casing, providing an insulating space between said up and down passages, said inner casing extending forwardly and connectlng with said outer casing, providing opposite double walled side walls about said snouts, and a box-like division plate connecting said side wallsabovesaid snout, the interior of the box-like division plate communicating with the insulating space of the said inner casing, with the space of I the double-walled side walls thereof and with the cold-air passage above said division plate.

2. In a hot-air single register furnace, the combination with a heater having forwardly extending feed and clean-out snouts, an outer casing around said heater connecting with said snouts, a double-walled inner casing between said heater and said outer casing spaced therefrom to provide an outer down cold-air passage and an inner up hotair passage, the said passages communicating near the bottom of said furnace and being connected to a common register at their tops, said double-walled inner casing pro viding an insulating space between said passages, said inner double-walled casing extending forwardly and connecting with said outer casing to form side walls about said shouts and providing extensions of said insulating space, and a hollow division plate connecting said side walls above said snout, the interior of said hollow division plate communicating with the insulating space of said double-walled insulating casing with the space between the side extensions of said llSlIlg and with the cold-air passage above said division plate.

my name,

3. In a hot-air single register furnace, the combination with a heater having forwardly extending feed and clean-out snouts, an outer casing around said heater connecting with said snouts, a double-walled inner insulating casing, spaced't-herefrom, to provide a down cold-air passage and an up hot-air passage, the said passages communicating near the bottom of said furnace and being connected to a common register at their tops, said double-walled inner casing providing an insulating space between said passages, said inner double-walled casing extending forwardly and connecting with said outer casing, to form double-walled side walls about said snouts, and to provideforward extensions of said insulating space, and a hollow division plate connecting said side walls and comprising a metallic box having openings in its bottom communicating with the spaces between said double-walled side walls, and having rows. of openings in its top communicating respectively with said hot and cold-air passages above said snouts.

4C. In a hot-air furnace, a heater having forwardly projecting snouts, a plurality of concentric casings aboutsaid heater, spaced from one another and from said heater, combining to provide an outer cold-air down passage and an inner hot-air rip-passage, said passages communicating at their base, the casings forming the intermediate passage, of the heater snouts, and connecting with the outer casing, and a hollow horizontal dividing wall, providing a connecting wall 5. In a hot-air furnace, a heater having plurality of forwardly projecting snouts, a concentric casings about said heater, spaced from one another and from said heater, combining sages connecting at their bases, the inner casings thereof angled to connect with the outer casing at opposite sides of said snouts, and a spaced double-wall cross-partition above said snouts, joining said casings to divide the outer passage from the inner, and provide circulating air space therebetween communicating with said outer and intermediate passages.

In witness whereof, I hereunto subscribe as attested by the two subscribing JULIUS B. KOEHLER.

witnesses.

Witnesses Loursn A, BECK,

FRANCIS E. ALDEN.

extending at an angle at opposite sides toprovide three vertical air pas- 

